SRVCC Handoff Without Indicator Using QCI and UE Capability
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Solution Overview
Problem
Current wireless communication systems face challenges in determining whether to invoke a single radio-type handover procedure when handing off a voice component from a packet data network to a circuit switched network, as existing methods require bandwidth-consuming indicators and software redesigns.
Innovation Solution
A communication system that implements an inter-technology Single Radio Voice Call Continuity (SRVCC) handoff by determining the presence of a voice component using a call-type identifier and the capability of the user equipment to operate in single radio mode, without the need for an SRVCC indicator, by utilizing configuration information and call-type identifiers like QoS Class Identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an SRVCC indicator is sent to the network to invoke a single radio-type handover procedure, then the handover can be properly invoked, but bandwidth is consumed and software redesign is required
Solution Approach 1:
The patent extracts the handover determination logic from the signaling process by having the UE autonomously determine whether it is a single-radio or multi-radio UE and select the appropriate handover procedure accordingly. This eliminates the need for the SRVCC indicator to be transmitted over the air interface, thereby saving bandwidth while maintaining reliable handover invocation.
Solution Approach 2:
The UE performs self-determination of its radio capability and self-selects the appropriate handover procedure (single-radio or multi-radio) based on its capabilities and the target RAT. This self-service approach removes the need for network-side indication mechanisms, reducing signaling overhead and bandwidth consumption while ensuring correct handover execution.
2Reliability
If an SRVCC indicator is sent to the network to invoke a single radio-type handover procedure, then the handover can be properly invoked, but software redesign is required
Solution Approach 1:
The patent removes the SRVCC indicator mechanism from the system, eliminating the need for software changes in network elements to support this signaling feature. The handover determination is instead embedded in the UE's autonomous decision-making process based on its capability knowledge.
Solution Approach 2:
Instead of having the network determine and signal the handover type to the UE, the invention inverts the approach by having the UE determine its own handover type based on its capabilities and the target RAT, then execute the appropriate procedure without network signaling.
3Reliability
If a single radio UE hands off from packet data network to circuit switched network, then voice service continuity is maintained, but the handover procedure complexity increases
Solution Approach 1:
The patent introduces dynamic selection of handover procedures based on UE capabilities and target RAT characteristics. The UE dynamically determines whether to execute single-radio or multi-radio handover procedures, adapting its behavior to the specific scenario rather than following a fixed complex procedure for all cases.
Solution Approach 2:
The handover procedure varies based on the parameter of UE radio capability (single-radio vs. multi-radio). By changing this parameter, the UE selects the appropriate handover mode, simplifying the overall system by allowing different procedure complexities for different UE types rather than requiring all UEs to support the most complex procedure.
Data Source
AI summary
A communication system is provided that implements an inter-technology SRVCC handoff without the need for an SRVCC indicator. A user equipment (UE) establishes a communication session that comprises a voice component in a packet data network. In response to determining to handoff the session to a target network, the communication system determines that the session comprises a voice component based on a call-type identifier, preferably a QoS Class Identifier (QCI), that is associated with a voice call and further determines that a target network is a circuit switched network based on configuration information maintained in association with the target network. In response to determining that the session comprises a voice component, that the target network is a circuit switched network, and, based on a profile of the UE, that the UE is capable of operation in single radio mode, the communication system determines to implement a SRVCC handoff procedure.